Figure 5-20.--Simple call-bell system.

The lower branch circuit, with two bells in parallel

A simplified call circuit is shown in figure 5-20. The

with each other and in series with one push button, is

upper branch circuit, with one bell and one push button

used to call two stations from one remote location.

in series with each other, is used to call a single station

from one remote location.

Note that the bells or signaling devices are

connected to the side of the lines bearing the negative

The center branch circuit, with two push buttons

designation EE. This arrangement is used on ac circuits

in parallel with each other and in series with the bell,

that have no polarity, but in which one side of the line

is used to call a single station from two remote

arbitrarily is designated as EE for convenience.

locations.

Figure 5-20.--Simple call-bell system.

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